Notification of Karenia mikimotoi bloom; Paralytic and Diarrhetic Shellfish Toxin Events in the South and Southwest
Karenia mikimotoi bloom event – Southwest Coast Updated 29-07-26
Please note moderate – high cell densities of the bloom forming dinoflagellate Karenia mikimotoi has been observed in multiple inshore locations along the Southwest over the last week. Please beware previous Karenia mikimotoi blooms in Ireland have also been associated with mortalities of marine organisms including flatfish, benthic invertebrates, as well as farmed shellfish and finfish. It is thought that these mortalities are as a result of depleted or low oxygen levels that can occur when the bloom begins to decay.
Diarhettic Shellfish Toxin Event – South Coast Updated 29-07-26
Please note quantifiable levels of Diarrhetic Shellfish Toxin (DST) have been detected in surf clams above regulatory limits (0.16µg) in Youghal Bay (DST concentration 0.34µg 20-07-26).
Quantifiable concentrations of DST’s concentrations have been observed in a number of production areas in both oysters and surf clams along the South Coast over the last weeks.
This coincides with the occurrence and increasing cell density (cells/litre) of the causative toxin producing phytoplankton species Dinophysis during the month of July..
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Diarhettic Shellfish Toxin Event – Southwest Coast - Castlemaine Kenmare, Bantry, Dunmanus Updated 29-07-26
Quantifiable concentrations of Diarrhetic Shellfish Toxin (DST’s) concentrations have been observed in a number of mussel and oyster sites in various production areas in Castlemaine, Kenmare, Bantry and Dunmanus bays, below the regulatory limit (0.16µg) during w/c 27th July 2026.
This coincides with the occurrence of the causative toxin producing phytoplankton species Dinophysis during the months of June and July present in these areas.
